Hydraulic jack



May l, 1928.

T. D. WHITE HYDRAULIC JACK Filed Jan. :'4. 1927 nl l 1.

l//////llll/ i Patented May l', 1.928.

UNITED STATES THOMAS D. TIBIITE, OF BELLEVILLE, ONTARIO, CANADA,ASSIGNOR T0 ROBERT I.,

, 1,667,159 PATENT OFFICE.

' GRAHAM, OF BELLEVILLE, CANADA.

HYDRAULIC Jack.

Application med January 3, 1927.- Serial No. 158,626.

This invention relates to jacks of the type in which a pump contained ina handleserves to pump oil from a reservoir to a n h draulic ram, and inwhich the handle'isF hinged so that, when the ram plunger is to belowered, the handle may be rought to a position to permit of a back flowfrom the ram to the reservoir.

My object 'in the present invention is to devise a reliable jack, whichmay be used any position and in which all 'danger of oil leakage, whenthe jack is carried on its side, is eliminated.

The main features ofmy invention are the location of the oil reservoir,as well as the pump, in the handle of the device, the 'positionin of aspring actuated follower over the o' in the reservoir to follow themoveupper end of the oil reservoir.

ments of the \oil, and the provision of spring actuated air inlet andoutlet valves at the Other features of novelty will appear from thedetailed descri tion and the accompany-TT ing drawings in w 'ch Fig. 1is a longitudinal section of my improved jack;

Fig. 2 a longitudinal section of the oil reservoir and pump, the sectionbeing taken in a plane at right angles-to Fig. 1;

Fig. 3 a cross section through the base of vthe oil reservoir andtrunnion, on which it has a bearing showing the parts in position toform a direct connection from the ram to the oil reservoir.'`

In the, drawings like numerals of reference indicatecorresponding partsin the different res.

the base of the jack, which carries the ram, and on which is journalledthe handle containing the oil reservoir andpunip. The cylinder 2 of theram is formed o f a section of `tube threaded into the base and providedat its upper end @with a stuing box 3,

through which passes a tube 4 forming the plunger of the rain. Thestuinghbox holdsv in place the cylinder lining 2*. e plun er head orpiston is of ordina type provi ed withv thel cu -leather 5, givlng theplunger an oil tight t with the' interior of the c linder. The screw isthreaded through a cad fitted to the plunger and is provided with a head7 adapted to engage the part to be lifted. y

On the base .is formed an annular socket 8 having a tapered bore, intowhich is-tted a 1 inafter described.

a passage 12 formed therethrough communieating with the conduit'll' andwith a notch 13 formed in the side of the trunnion, which notch isextended through an arc approximating 90 or rather more. On thistrunnion a handle is hinged forming the oil reservoir and carrying theoil pump. The reservoir comprises the base 14 and a head 15 connected bya tube 16. The base has communicating passa es 17 and' 18 formedtherein, the passage 1 forming a communication between the pum cylinderand the opening-in the base receiving the trunnion, and the passage 18forming a communication between the passa e 17 and the interior of theoilreservoir. and 2O of known type and fitted in a known manner form thepump valves, the valves both opening downwardly. The ump cylinder 21 isthreaded into a suitabie opening in the base and its upper end itswithina pring actuated valves 19 sleeve 22 of the stuiing box formed on thehead 15. A coil spring 23 bears against the end of the cylinder tube andthe packing material in the stuffing box and serves to make a tightjoint for a plunger 24, which passes through the stuffing box and downinto the pump cylinder 21. Theoperating connections with this plungerwill be here- 25 is a elief assa e formed throu h the base 14 he side othe base nearest t e ram and communicatingwith the opening in the basein which the trunnion 9 is received. With the parts in the positionshown in Fig. l, both the passage 17 and the relief passage 25 areclosed b the solid part of the trunnion. 'It will e evident, however,that if the reservoir be swung outwardly so that the notch 13 is incommunication with the inner end ofthe passage- 17 the operation of losi reservoir be swung to the position shown in r Fig. 3, the reliefpassage 25 will be brought to which it has been raised. Into -the head lof the oil reservoir is screwed the lower end of a tube 26 which servesas a ide for a pump handle 27, which passes t rough a cap 2,8 screwed onthe upper end of the tube 26 and is provided with a hand knob 29. Theplunger 24 is pinned to the tube 26, by means of the pin 30. Between.the head 15 of the oil reservoir and the shoulder formed by the lowerend of the tube 26 is located a coil spring 31, which serves toelastically limit the downward movement of the pump plunger. Animportant the means* provided to retain the oil in the lower part of thereservoir no matter what the position of the ram or the position of thejack is as a whole.

On the pump cylinder 21 is positioned a follower comprising a head 32,on which is clamped, by means of a ring 33 and bolts 34, .a leather.cup-washer 35, which bears .against both the exterior of the pumpcylinder 21 and the interior of the wall-of the reservoir. A coilvspring 36 bears against the followe'r'f and the head 15. This springcauses the. follower to follow the oilY level fin the reservoir andprevents it leaking through Vtothe upper part of the reservoir.

The punip and oil passages are thus always' kept full of oil, so thatthere is no danger at any time of the pump -failing to work4 throughlack ofv priming after it has lain for a considerable time in ahorizontal or other position otherwise likel to drain the oil passages.Leakage of 011 through the headthe oil, itis necessary to provide anair' assage o r passages through the head` 15.

ile a simple breather hole would be sufficient, it is preferable tohaveany passage to the` interior of thefupper end of the voil reservoirvalve controlled as an extra safedirt from entering, the oil chamber,hence I employ the two 1Eassages 37 through the 'head vmi- 15, onecontro ng by an inwardly opening spring actuatedvalve 38 and the otherby an outwardly opening valve 39. These are of known type and-arrangedin a 'known manner.-

What I claim is:

. An'fhygraulic jack' comprisinga ram ;l a'- trunnion ed thereonhaving'a single pas'- sage therethrough communicating with the featureof my invention is 'interior of the ram below the plunger there. of; anda handle hinged on the trunnion adapted to form a direct connectionfromy .the ram to the reservoir through the trun- Iion when the handleis suitably positioned.

3. An hydraulic jack comprising a ram; a trunnion thereon havin apassage therethrough communicating with the interior 0f the ram belowthe plunger thereof; an oil reservoir, forming a handle, having a basejournalled on the trunnion; a pump cylinder within the reservoir.,passages in the base communicating with the cylinder, the--lll reservoirand the opening in the base for the trunnion; spring actuated inlet andoutlet valves in s'aid passages; and a relief passagevl extending fromsaid opening to the reservoir, the openings of saidJ passages and thepassage through the trunnion being so positioned and proportioned that,in one position of the handle, the pump is in connection with the ramand'in another position vthe reservoir is in direct connection with theram.

4. A hydraulic jack comprising a rain; ay .handle connected therewithcontaining an oil reservoir; a. pump adapted to pump oil from thereservoir to the ram; and av spring actuated followerin the reservoiradapted to follow the oil. ,l

' 5. A hydraulic jack comprising a ram; a handle connected therewithcontaining an oil reservoir; a pump adapted -to pump oil from thereservoirto the ramhaving its y cylinder axially arranged within thereser- 'z'voir; and a spring actuated follower in the guard againstleakage when the Jack is laid on its side, and also to prevent dust and'reservoir sliding on the pump cylinder and adapted to follow the oil. v

6. A hydraulic jack comprising a ram; a handle connected therewithcontaining an oil reservoir; a pump adapted to pump oil from thereservoir to the ram; a spring actuated follower in the reservoiradapted to follow the oil; and spring-valve controlled breather passagesleading` to the upper part of the reservoir.

Signed at Belleville, Ont., Camfuthis,

eleventh day of December, 1926.

D. WHITE.

